Carburizing pot



7, 9 T. A. FRISCHMAN El AL 2,178,683

CARBURIZING POT Filed Sept. 20, 1937 ,0 ill I 15 hlull-J 6- 2 I INVENTORS 7/70/1446 1418597 fi/sa/MA/V By 6007/: G3 SHOIVTZ ATTORNEYS.

Patented Nov. 7, 1939 UNITED? STA PATENT oFriicE CARBURIZING POT Application September 20, 1937, Serial No. 164,700

1 Claim.

The present invention relates to carburizing pots and more particularly to carburizing pots of the chimney type.

An object of the present invention is the provision of a novel sheet metal chimney type carburizing pot which will have a maximum of heating surface, while requiring a minimum amount of carburizing compound.

Another object of the invention is the .provision of a novel chimney type carburizing pot in which the chimney is separate and removable from the pot proper.

Another object of the present invention is the provision of a novel chimney type carburizing pot which will be inexpensive to manufacture and can be readily repaired, and in which the stresses set up by uneven heating and cooling will bereduced to a minimum.

The present invention resides in certain details of construction, and combinations and arrangements of parts, and further objects and advantages thereof will be apparent to those skilled in the art to which the invention relates, from the following description of the preferred embodiment thereof described with reference to the accompanying drawing, forming a part of this specification, in which similar reference characters designate corresponding parts, and in which:

Fig. l is a plan view of a chimney type carburizing pot embodying the present invention, and

Fig. 2 is a side elevation, with portions broken away, of the carburizing pot shown in Fig.1.

While the invention is susceptible of various modifications and alternative constructions, it is herein illustrated and described as embodied in a circular chimney type carburizing pot, particularly adapted for the heat treating of annular articles, such as ring gears or the like.

Referring to the drawing the carburizing pot shown therein comprises three separate parts, a tubular body closed at one end designated generally by the reference character A; a removable cover therefor designated generally by the reference character B; and a removable chimney C.

The body member comprises a sheet metal plate the opposite ends of which are welded together as at E to form a tubular body portion H, the lower end of which is closed by a plate I2 which also serves as the bottom of the pot and which has a central aperture l3 therein defined by an upwardly projecting flange I4 formed integral with the bottom plate I2. The bottom plate I2 is connected to the cylindrical portion II of the body member through the medium of a peripheral flange I5, within which the lower end of the memher I I extends. As shown, the upper edge of the flange I5 is welded to the member II, as at I6. The upper end of the tubular body portion II of the pot proper is reinforced with an external band I! extending therearound and welded thereto as at I8.

The cover B comprises a substantially annular plate member I9 having a central aperture 20 therein, of approximately the same diameter as the aperture I3 in the bottom II. A metal band or ring 2| welded to the under side of the plate I9, adjacent aperture 20, forms a downwardly projecting flange similar to the upwardly projecting flange I3 at the bottom. The chimney C comprises a vertical cylindrical tubular member supported on the bottom I2 with the flanges I3 and ZI extending into opposite ends thereof.

While the carburizing pot shown may be used for treating different articles, it is especially adapted for the treating of annular articles or blanks, such as ring gears and the like. Various size chimneys may be used interchangeably in the pot, and by using chimneys which approximate the inside diameter of the work or blank being treated maximum heating surface is obtained while the amount of carburizing compound used is maintained at a minimum. The removable chimney also facilitates manufacture and repair, reduces the stresses set up by uneven heating and cooling, and facilitates centering the chimney and applying the cover, since the chimhey can be readily moved even though the bottom is warped. The work or blanks can also be readily removed by first withdrawing the chimney.

From the foregoing description of the preferred embodiment of the invention it will be apparent that the objects of the invention heretofore enumerated and others have been accomplished and that a novel carburizing pot has been provided. While the preferred embodiment of the invention has been illustrated and described in considerable detail it is to be understood that the invention may be otherwise embodied, and we do not wish to be limited to the particular construction herein shown and described. It is our intention to cover hereby all modifications, adaptations and variations of the present invention which come within the practice of those skilled in the art to which the invention relates, and within the spirit and scope of the invention as defined in the following claim.

able cover for said pot adapted to be supported on the upper end of said body portion and having a central aperture therein defined by an inwardly projecting flange; and a removable sheet metal chimney within said body portion and telescoping both of said flanges.

THOMAS ALBERT FRISCHMAN. CURTIS G. SHONTZ. 

